114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
// Code partly derived from ILI9341_due library example
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// Draws the 3 icons across the middle of the screen and pauses.
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// Then draws 300 icons at random locations, clears screen and repeats
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//
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// This demonstrates drawing icons from FLASH
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// Icons are stored in tabs, e.g. Alert.h etc
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// more than one icon can be in a header file.
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/*
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This sketch demonstrates loading images from arrays stored in program (FLASH) memory.
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Works with TFT_eSPI library here:
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https://github.com/Bodmer/TFT_eSPI
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This sketch does not use/need any fonts at all...
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Arrays containing FLASH images can be created with UTFT library tool:
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(libraries\UTFT\Tools\ImageConverter565.exe)
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Convert to .c format then copy into a new tab
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The number and size of icons is limited by available FLASH memory. The icon array will
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use width x height x 2 bytes of FLASH, i.e. 32 x 32 icon uses ~2048 bytes
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*/
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#include <TFT_eSPI.h> // Hardware-specific library
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#include <SPI.h>
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library with default width and height
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// Include the header files that contain the icons
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#include "alert.h"
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#include "Close.h"
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#include "Info.h"
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long count = 0; // Loop count
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void setup()
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{
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Serial.begin(115200);
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tft.begin();
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tft.setRotation(1); // landscape
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tft.fillScreen(TFT_BLACK);
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// Draw the icons
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drawIcon(info, (tft.width() - infoWidth)/2 - 50, (tft.height() - infoHeight)/2, infoWidth, infoHeight);
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drawIcon(alert, (tft.width() - alertWidth)/2, (tft.height() - alertHeight)/2, alertWidth, alertHeight);
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drawIcon(close, (tft.width() - closeWidth)/2 + 50, (tft.height() - closeHeight)/2, closeWidth, closeHeight);
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// Pause here to admire the icons!
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delay(4000);
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}
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void loop()
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{
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// Loop filling and clearing screen
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drawIcon(info, random(tft.width() - infoWidth), random(tft.height() - infoHeight), infoWidth, infoHeight);
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drawIcon(alert, random(tft.width() - alertWidth), random(tft.height() - alertHeight), alertWidth, alertHeight);
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drawIcon(close, random(tft.width() - closeWidth), random(tft.height() - closeHeight), alertWidth, closeHeight);
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// Clear screen after 100 x 3 = 300 icons drawn
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if (100 == count++) {
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count = 1;
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tft.setRotation(2 * random(2)); // Rotate randomly to clear display left>right or right>left to reduce monotony!
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tft.fillScreen(TFT_BLACK);
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tft.setRotation(1);
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Serial.println(millis());
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}
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}
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//====================================================================================
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// This is the function to draw the icon stored as an array in program memory (FLASH)
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//====================================================================================
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// To speed up rendering we use a 64 pixel buffer
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#define BUFF_SIZE 64
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// Draw array "icon" of defined width and height at coordinate x,y
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// Maximum icon size is 255x255 pixels to avoid integer overflow
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void drawIcon(const unsigned short* icon, int16_t x, int16_t y, int8_t width, int8_t height) {
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uint16_t pix_buffer[BUFF_SIZE]; // Pixel buffer (16 bits per pixel)
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// Set up a window the right size to stream pixels into
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tft.setWindow(x, y, x + width - 1, y + height - 1);
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// Work out the number whole buffers to send
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uint16_t nb = ((uint16_t)height * width) / BUFF_SIZE;
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// Fill and send "nb" buffers to TFT
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for (int i = 0; i < nb; i++) {
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for (int j = 0; j < BUFF_SIZE; j++) {
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pix_buffer[j] = pgm_read_word(&icon[i * BUFF_SIZE + j]);
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}
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tft.pushColors(pix_buffer, BUFF_SIZE);
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}
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// Work out number of pixels not yet sent
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uint16_t np = ((uint16_t)height * width) % BUFF_SIZE;
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// Send any partial buffer left over
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if (np) {
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for (int i = 0; i < np; i++) pix_buffer[i] = pgm_read_word(&icon[nb * BUFF_SIZE + i]);
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tft.pushColors(pix_buffer, np);
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}
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}
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